The worst terrorist attack ever on U.S. soil took place ten years ago next month. The tragic events of September 11, 2001 affected the lives of millions of people, not only in New York, Washington D.C. and Pennsylvania, but around the world.

Working with The New York Times, we’re marking the 10th anniversary of 9/11 with a dedicated YouTube channel, featuring special content from the New York Times, archived news broadcasts from September 2001, and your own personal stories and tributes. We hope this channel will provide an enduring record of what took place on that day.

We’re asking you to share with us:

Your strongest memory of that day or that time period

How 9/11 changed you, and how you believe it changed America

What you lost — or gained -- because of 9/11

Make a video answering any of these questions and submit it to youtube.com/September11. A selection of your videos will be featured on the The New York Times website and YouTube homepage on September 11 this year.

Through telling and sharing stories, we can all hope to make sense of an event that, for many of us, was one of the defining moments of our lives. Thank you for sharing yours.